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authorBorislav Petkov <bp@suse.de>2016-02-16 00:19:18 +0100
committerIngo Molnar <mingo@kernel.org>2016-02-16 08:45:15 +0100
commitf2cc8e0791c70833758101d9756609a08dd601ec (patch)
treea9322f722ebf4349c3503d28b3082975e968f975 /mm/mmap.c
parentx86/mm: Honour passed pgprot in track_pfn_insert() and track_pfn_remap() (diff)
downloadlinux-f2cc8e0791c70833758101d9756609a08dd601ec.tar.xz
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x86/cpufeature: Speed up cpu_feature_enabled()
When GCC cannot do constant folding for this macro, it falls back to cpu_has(). But static_cpu_has() is optimal and it works at all times now. So use it and speedup the fallback case. Before we had this: mov 0x99d674(%rip),%rdx # ffffffff81b0d9f4 <boot_cpu_data+0x34> shr $0x2e,%rdx and $0x1,%edx jne ffffffff811704e9 <do_munmap+0x3f9> After alternatives patching, it turns into: jmp 0xffffffff81170390 nopl (%rax) ... callq ffffffff81056e00 <mpx_notify_unmap> ffffffff81170390: mov 0x170(%r12),%rdi Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Joerg Roedel <joro@8bytes.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1455578358-28347-1-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/mmap.c')
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